A floor needs a small, even space around its edges, and the right size depends on the material. Swiss Krono's installation FAQ asks for at least 3/8 inch on all sides of a laminate room. COREtec's SPC guidelines call for 1/4 inch on rigid-core vinyl floors under 2,500 sq ft. For wood, the NWFA rule is a gap roughly equal to the board's thickness. So how much expansion gap for laminate flooring is enough? Start with your plank's own instructions, then use the figures below, shown on three floors we stock, including a Swiss Krono plank from our laminate flooring collection. This page covers setting the gap before the floor goes down; repair posts are linked further on.
Expansion gap sizes by floor type
Each figure comes from a published installation document. NWFA's wood guidance applies "unless otherwise directed by the flooring manufacturer," so a maker's own number comes first.
| Floor type | Perimeter gap | Where the figure comes from |
|---|---|---|
| Click-lock laminate | Minimum 3/8 inch on all sides of the room | Swiss Krono installation FAQ |
| SPC rigid-core vinyl plank | 1/4 inch for areas under 2,500 sq ft; 1/2 inch for larger areas | COREtec Pro SPC installation guidelines (Shaw) |
| Floating engineered hardwood | Generally equal to the board thickness | NWFA installation guidelines, floating floors |
| Nail-down solid or engineered hardwood | Generally equal to the board thickness; spans wider than 20 feet may also need spacing between rows | NWFA installation guidelines, nail-down |
Three floors we stock and the gap each one calls for
These current products cover laminate, SPC vinyl and nail-down engineered hardwood. Prices are per box; we divide by box coverage for the per-square-foot figure.
| Product | Material and thickness | Install method | Box price / coverage | Per sq ft | Gap to plan for |
|---|---|---|---|---|---|
| Swiss Krono Grey Oak (MV 803), AC5 | Laminate, 10mm | Click-lock | $42.83 / 17.22 sq ft | $2.49 | 3/8 inch minimum (Swiss Krono) |
| Riche Flooring Heavy-Duty SPC, Driftwood Mist | SPC vinyl, 8mm, 20mil wear layer | Click-lock | $59.00 / 16.55 sq ft | $3.56 | Confirm with the plank's instructions; COREtec's figure is 1/4 inch under 2,500 sq ft |
| Villa European Oak, wire brushed | Engineered hardwood, 3/4 inch | Nail-down | $97.00 / 19.42 sq ft | $4.99 | About 3/4 inch under the NWFA thickness rule |
Prices checked October 6, 2026. Box prices and coverage come from our current catalogue.
The Swiss Krono plank is a German-made AC5 laminate with a click-lock joint, so it floats over the subfloor and moves as one unit.
Why the edges of a floating floor need open space
The NWFA glossary defines the expansion gap as a space needed between fixed objects, naming walls, pipes and cabinets, "to allow for the movement of the flooring system." The wording is written for wood, but the idea carries over to laminate and SPC, whose planks lock to each other rather than to the subfloor. Swiss Krono adds that temperature and humidity can vary from room to room, so rooms can expand and contract by different amounts.
Anything that pins the floor stops that movement. NWFA notes that a point load of more than 600 lbs on a single board can keep a floor from floating, and says floating floors should not be installed where future fixed cabinetry, such as a kitchen island, will lock the floor down.
Where to leave the gap: walls, islands, pipes, doorways and long runs
- Every wall. Swiss Krono's figure is a minimum for all sides of the room.
- Kitchen islands. Swiss Krono describes laying planks around an island with a 3/8-inch gap between island and floor. NWFA prefers keeping a floating floor out from under future fixed cabinetry, so settle the island plan first.
- Pipes, fireplaces and stair stringers. NWFA names pipes in its definition, and says spots that cannot take baseboard or shoe moulding, such as stone fireplaces and staircase stringers, still need adequate expansion.
- Doorways. For floating wood floors, NWFA calls for transition pieces at doorways less than 4 feet wide. Swiss Krono's FAQ says the T-molding in a doorway will prevent the floor from buckling.
- Long runs. NWFA also asks for transitions inside a floating wood floor spanning more than 20 feet in width or more than 40 feet in length, unless the manufacturer directs otherwise.
The Riche Heavy-Duty SPC plank has a 20mil wear layer and is 8mm thick in total; its product page breaks that down as a 6mm SPC core plus a 2mm pre-attached EVA pad. It clicks together and floats like laminate. COREtec's rigid-core guidelines tie the SPC gap to floor area: 1/4 inch below 2,500 sq ft and 1/2 inch above it. Riche's own instructions are the final word for this plank, so confirm the number there or ask us at quote time.
Setting the gap during installation, step by step
- Take off the old trim. NWFA's installation steps begin by removing existing base, shoe moulding and doorway thresholds, which can go back on afterwards.
- Undercut the door casings. For floating floors, NWFA says to undercut casings 1/16 inch higher than the flooring plus underlayment.
- Plan the rows with the gap included. Swiss Krono's method: measure the net width of the room, deduct the gap on both sides, and divide by the plank width. A room 144 inches wide with 3/8 inch at each wall leaves 143.25 inches to fill. Swiss Krono's narrowest allowed piece is 2.5 inches wide, so rip the first row too if the last one comes out narrower.
- Set spacers at every wall and fixed object and keep them in while the rows go down.
- Add transitions at doorways and long runs, and leave the gap open around islands and pipes.
- Fasten trim to the wall, not the floor. NWFA says trim on a floating wood floor should sit a minimum of 1/16 inch off the surface and not be fastened to or through the flooring. COREtec's SPC guide likewise says not to fasten wall mouldings or transition strips to the planks.
For how each install method and subfloor fits together, see our complete flooring installation guide for Ontario homes.
Nail-down hardwood still needs space at the walls
A nailed floor does not float, but the wood still swells and shrinks with moisture. For nail-down solid and engineered floors, NWFA says the expansion space at vertical obstructions "generally is equal to the thickness of the material being installed," with the example of 1/2 inch material needing 1/2 inch. A hardwood install with no expansion gap at the walls goes against that guidance.
Our Villa European Oak engineered plank is 3/4 inch thick, 7.5 inches wide and listed for nail-down installation, so the NWFA rule points to about 3/4 inch at the walls unless its own instructions say otherwise. On spans wider than 20 feet, NWFA adds that spacing between rows may be needed, depending on species, climate zone, indoor climate control and time of year.
Covering the gap with baseboard or quarter round, and what it costs
Plan the gap and the trim together. NWFA describes traditional baseboard profiles as 3/8 inch to 3/4 inch thick, and base shoe as a narrow moulding used with, or instead of, baseboard "to conceal the required expansion space." Base shoe runs 3/8 inch to 5/8 inch thick in the same guide. Any baseboard in that range covers a 3/8 inch laminate gap, but a 3/4 inch hardwood gap is wider than a 3/8 inch baseboard, which is where quarter round or base shoe helps. Keeping your old baseboards? Our article on matching baseboards to new flooring covers the height change.
Our quarter round installation rate is $1.30 per linear ft in a house or basement and $1.60 per linear ft in a condo, covering removal of the old quarter round and supply and installation of new, unpainted. We estimate footage as floor area times 0.3. Flooring material, floor installation labour and delivery are not included below and are confirmed at quote.
| Space | Floor area | Trim estimate (area x 0.3) | House or basement at $1.30 | Condo at $1.60 |
|---|---|---|---|---|
| 12 x 14 ft bedroom | 168 sq ft | 50.4 lin ft | $65.52 | $80.64 |
| Open living and dining area | 600 sq ft | 180 lin ft | $234.00 | $288.00 |
With 13% HST added, the bedroom comes to $74.04 in a house or $91.12 in a condo, and the 600 sq ft area to $264.42 or $325.44. The multiplier is an estimate: that bedroom has 52 ft of wall before door openings, close to the 50.4 lin ft figure, so measure your own walls for the quote. Full baseboard pricing is in our baseboard and trim installation cost guide, and our flooring installation cost guide covers labour for the floor itself.
What goes wrong when the gap is missing
A floating floor with no room at its edges has nowhere to go when it expands. Swiss Krono links doorway transitions to preventing buckling, and NWFA's guidance on islands and heavy loads makes the same point: a pinned floor stops floating. One visible result is a seam that rises into a ridge. A gap wider than the trim in front of it causes the opposite problem, an open strip at the wall.
If a floor is already lifting, our posts on laminate seams that lift and vinyl planks that lift cover diagnosis and repair.
Expansion gap questions from homeowners
Can I fill the gap around my floor with gap filler or caulk?
The perimeter space is meant to stay open so the floor can move, which is why trim covers it instead. The exception in the instructions quoted here is wet areas: Swiss Krono says expansion spaces around sinks, refrigerators and other spots where water may occasionally be present must be filled with 100% mildew-resistant silicone sealant, and COREtec asks for flexible silicone caulk around the perimeter in wet areas such as bathrooms.
Does vinyl plank flooring need an expansion gap?
COREtec's guidelines call for a perimeter gap on its SPC, sized by floor area, for glue-down as well as floating installs. For any other click-lock vinyl, check the plank's own instructions for the exact size. Gaps that open between individual planks over time are a separate issue from this space at the walls.
How do I fix a floating floor that was installed with no gap?
Find the pinch point first: trim nailed through the planks, an island sitting on the floor, a door casing the floor butts against, or a wide opening with no transition. Releasing it generally means lifting the trim, cutting the floor back from the wall to restore the space, and refastening the trim to the wall only. Cutting back an installed floor is not on our standard rate list, so we price that work after viewing the floor.
Does a nail-down hardwood floor need a gap at the walls?
Yes. Nails hold the boards down but do not stop wood from moving with moisture, and NWFA applies its thickness rule to nail-down installs. For a 3/4 inch board, plan roughly that width at every wall and choose trim thick enough to cover it.
Get your floor and trim quoted together
Send us your room sizes and chosen floor, and we will quote the flooring, the installation and the trim that covers the gap. You can request a quote online or reach us through our contact page.
Top Floorings Depot
3781 Victoria Park Avenue, Unit 1, Toronto, ON M1W 3K5
www.topfloorings.com
Call: 416-499-0117
Text: 416-770-8819